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16 Cards in this Set
- Front
- Back
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What does a Mollier Diagram represent? |
The Relationships between: Pressure Temperature Enthalpy Entropy Density |
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What does Point A on the Mollier Diagram represent? |
A saturated liquid |
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What does Point B represent on the Mollier Diagram? |
A two phase region |
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What does Point C represent on the Mollier Diagram? |
Saturated Vapor |
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What does Point D represent on the Mollier Diagram? |
Superheated vapour |
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What does the line connecting Point A to Point B mean? |
No change in energy |
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What does the line connecting Point A to Point B mean? |
No change in energy |
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What does the line connecting Point B to Point C mean? |
An increase in Energy |
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What does the line connecting Point A to Point B mean? |
No change in energy |
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What does the line connecting Point B to Point C mean? |
An increase in Energy |
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What does the line connecting Point C to Point D mean? |
Energy Increase |
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What does the line connecting Point D to Point A mean? |
Energy Decrease |
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What is the purpose of the Refrigeration Cycle |
To create a cooling medium at a low temperature |
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Describe the Refrigeration process |
Saturated liquid at point a flashes across a valve from Point A to Point B, producing a two phase fluid From Point B to Point C, the liquid phase portion of the fluid is vaporized due to the absorption of heat from a process stream at at heat exchanger To condense the vapour, it is compressed from Point C to Point D. (Temp depends on mechanical efficiency of the compressor-in theory a 100% efficient compressor results in no entropy) At Point D to Point A the Vapour is condensed to a liquid |
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Describe the Refrigeration process |
Saturated liquid at point a flashes across a valve from Point A to Point B, producing a two phase fluid From Point B to Point C, the liquid phase portion of the fluid is vaporized due to the absorption of heat from a process stream at at heat exchanger To condense the vapour, it is compressed from Point C to Point D. (Temp depends on mechanical efficiency of the compressor-in theory a 100% efficient compressor results in no entropy) At Point D to Point A the Vapour is condensed to a liquid |
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What does the economizer do? |
Puts two streams into indirect contact to preform the heat exchange process Reduces the size of the needed compressor and condenser, and saves power |
